Low energy fast events from radon progenies at the surface of a CsI(Tl) scintillator

Authors :: Kim, S. C.
Bhang, H.
Choi, J. H.
Kang, W. G.
Kim, H. J.
Kim, K. W.
Kim, S. K.
Kim, Y. D.
Lee, H. S.
Lee, J. I.
Lee, J. H.
Lee, J. K.
Lee, M. J.
Lee, S. J.
Li, J.
Li, Y. J.
Li, X.
Myung, S. S.
Olsen, S. L.
Ryu, S.
Seong, I. S.
So, J. H.
Yue, Q.
Source :: Astroparticle Physics 35 (2012) 781-784
Publication Year :: 2011
Abstract: In searches for rare phenomena such as elastic scattering of dark matter particles or neutrinoless double beta decay, alpha decays of Rn222 progenies attached to the surfaces of the detection material have been identified as a serious source of background. In measurements with CsI(Tl) scintillator crystals, we demonstrate that alpha decays of surface contaminants produce fast signals with a characteristic mean-time distribution that is distinct from those of neutron- and gamma-induced events.<br />Comment: 9 pages, 8 figures

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